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3 years ago

Help me please and dont scam the points

Mathematics

1 answer:

kicyunya [14]3 years ago

4 0

Answer:

So the answer is 14 seconds.

Step-by-step explanation:

Median means the number in the middle, and 17 and 11 are in the middle. Because there's 2 numbers in the middle, you need to average them to find the answer.

17+11=28

28 / 2= 14. So the answer is <u>14 </u><u>seconds</u>.

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Ten cats eat 4 cans of cat food. How many cats eat 7.2 cans of food?

padilas [110]

Answer:

18 cats

Step-by-step explanation:

Set up as a proportion

x / 7.2 = 10/4

Multiply both sides by 7.2

x = 10/4 * 7.2

x = 18

6 0

3 years ago

Can someone help me with #18 & #20?

Nuetrik [128]

Answer:

$\large\boxed{18)\ x=13\ and\ y=9}\\\boxed{20)\ AO=8}$

Step-by-step explanation:

18)

If a quadrilateral is inscribed in a circle, the opposite angles add up to 180°.

Therefore we have the system of equations:

$\left\{\begin{array}{ccc}(6x+23)+(8y+7)=180\\(6x-4)+(12y-2)=180\end{array}\right\\\\\left\{\begin{array}{ccc}6x+8y+(23+7)=180\\6x+12y+(-4-2)=180\end{array}\right\\\left\{\begin{array}{ccc}6x+8y+30=180&|\text{subtract 30 from both sides}\\6x+12y-6=180&|\text{add 6 to both sides}\end{array}\right\\\left\{\begin{array}{ccc}6x+8y=150\\6x+12y=186&|\text{multiply both sides by (-1)}\end{array}\right$

$\underline{+\\\left\{\begin{array}{ccc}6x+8y=150\\-6x-12y=-186\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad\qquad-4y=-36\qquad|\text{divide both sides by (-4)}\\.\qquad\qquad\boxed{y=9}\\\\\text{Put the value of y to the first equation and solve them for x:}\\\\6x+8(9)=150\\6x+72=150\qquad\text{subtract 72 from both sides}\\6x=78\qquad\text{divide both sides by 6}\\\boxed{x=13}$

20)

If line AB is tangent to the circle, then the angle A is a right angle

$m\angle A=90^o$

Therefore the triangle is a right triangle. We can use the Pythagorean theorem:

Let O - center of the circle. Therefoe OA is the radius of a circle.

From a Pythagorean theorem:

$AO^2+15^2=(9+8)^2\\\\AO^2+225=17^2\\\\AO^2+225=289\qquad\text{subtract 225 from both sides}\\\\AO^2=64\to AO=\sqrt{64}\\\\AO=8$

4 0

3 years ago

Dennis wants an average of 90 or higher in math class. Currently he

alexandr1967 [171]

Answer:

With the listed scores, he already has an average of 90.6 He needs to score a minimum of 87 to keep an average of 90.

4 0

2 years ago

I really need help please

Elena L [17]

Answer:

i dont care F

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

What is the 5th term in the geometric sequence with a1 = 3 and ratio (multiplier) = 0.25?

Dahasolnce [82]

First term = 3
multiplier = 0.25

second term = 3 * (1/4)
third term = 3 * (1/4)^2
fourth term = 3 * (1/4)^3
fifth term = 3 * (1/4)^4

Can you simplify the fifth term?

5 0

3 years ago